Thermal string excitations in artificial spin-ice square dipolar arrays

We report on a theoretical investigation of artificial spin-ice dipolar arrays using a nanoisland shape adopted from recent experiments (Farhan et al 2013 Nature Phys. 9 375). The number of thermal magnetic string excitations in the square lattice is drastically increased by a vertical displacement...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2014-07, Vol.26 (26), p.266006-8
Main Authors: Thonig, D, Reißaus, S, Mertig, I, Henk, J
Format: Article
Language:English
Subjects:
Arrays
Classical spin model
Classical spin models
Computer simulation
Condensed matter
Condensed matter physics
Displacements (lattice)
Excitation
Ice
Kinetic monte carlo simulation
Low temperatures
magnetic monopoles
micromagnetic simulations
Monte Carlo methods
Nanostructure
Physics
spin-ice dipolar arrays
Strings
Theoretical investigations
Vertical displacements
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Summary:We report on a theoretical investigation of artificial spin-ice dipolar arrays using a nanoisland shape adopted from recent experiments (Farhan et al 2013 Nature Phys. 9 375). The number of thermal magnetic string excitations in the square lattice is drastically increased by a vertical displacement of rows and columns. We find large increments especially for low temperatures and for string excitations with quasi-monopoles of charges ±4. By kinetic Monte Carlo simulations we address the thermal stability of such excitations, thereby providing time scales for their experimental observation.
ISSN:0953-8984
1361-648X
1361-648X
DOI:10.1088/0953-8984/26/26/266006